use flakes instead of niv & stuff

16 files changed, 144 insertions, 445 deletions

diff --git a/default.nix b/default.nix
deleted file mode 100644
index f13eb77..0000000
--- a/default.nix
+++ /dev/null
@@ -1,18 +0,0 @@
-let
-  sources = import ./nix/sources.nix;
-  pkgs = import ./pkgs {};
-
-  hosts = import ./lib/hosts.nix {
-    inherit pkgs;
-    hostsDir = ./hosts;
-    commonImports = [ ./common ];
-    pkgsPath = ./pkgs;
-  };
-in 
-{
-  inherit sources pkgs;
-  inherit (hosts) hosts groups;
-  deploy = import ./lib/deploy.nix { inherit pkgs; inherit (hosts) hosts groups; };
-}
-
-
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..2aac064
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,93 @@
+{
+  "nodes": {
+    "blog": {
+      "flake": false,
+      "locked": {
+        "narHash": "sha256-vsj1iq/W5ofZhQ1MkpP3iSeBhYfSUj9RlEY2kiG07yA=",
+        "path": "/home/stuebinm/Dokumente/blog",
+        "type": "path"
+      },
+      "original": {
+        "path": "/home/stuebinm/Dokumente/blog",
+        "type": "path"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1641687203,
+        "narHash": "sha256-W6Xrb/l1x+E+WMVLw4q5HUnNjt3x4WQFSYJtjJtopbU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "00acdb2aa817048fbe1f91ece18fe7de09762531",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "release-21.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-unstable": {
+      "locked": {
+        "lastModified": 1641671388,
+        "narHash": "sha256-aHoO6CpPLJK8hLkPJrpMnCRnj3YbfQZ7HNcXcnI83E0=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "32356ce11b8cc5cc421b68138ae8c730cc8ad4a2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "blog": "blog",
+        "nixpkgs": "nixpkgs",
+        "nixpkgs-unstable": "nixpkgs-unstable",
+        "tracktrain": "tracktrain",
+        "uplcg": "uplcg"
+      }
+    },
+    "tracktrain": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1641709913,
+        "narHash": "sha256-zIc6Or0n2klhycD71d0T+FaB4asAevK5XkpnVQviO3A=",
+        "ref": "main",
+        "rev": "973f086e1882dfaa48f40a91b5f8c679076b6fb6",
+        "revCount": 5,
+        "type": "git",
+        "url": "https://stuebinm.eu/git/tracktrain"
+      },
+      "original": {
+        "ref": "main",
+        "type": "git",
+        "url": "https://stuebinm.eu/git/tracktrain"
+      }
+    },
+    "uplcg": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1638532574,
+        "narHash": "sha256-diZaAMiqOUVeEyGujEY5tejbyKdpecR/dRPLcAlKLWw=",
+        "ref": "main",
+        "rev": "8c19e63eb67093f960be060f08a873a9d696d226",
+        "revCount": 121,
+        "type": "git",
+        "url": "https://stuebinm.eu/git/uplcg"
+      },
+      "original": {
+        "ref": "main",
+        "type": "git",
+        "url": "https://stuebinm.eu/git/uplcg"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
index 069fcfd..e86a636 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,18 +3,42 @@
   description = "testing nix flakes for server deployment";
 
   inputs = {
-    nixpkgs = "github:NixOS/nixpkgs#release-21.11";
-    nixpkgs-unstalbe = "github:NixOS/nixpkgs#nixpkgs-unstable";
-    uplcg = "git:https//stuebinm.eu/git/uplcg";
-    woitb = "git:https://stuebinm.eu/git/woitb";
-    workadventure = "git:https://stuebinm.eu/git/workadventure-nix";
+    nixpkgs.url = "github:NixOS/nixpkgs/release-21.11";
+    nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    uplcg = {
+      url = "git+https://stuebinm.eu/git/uplcg?ref=main";
+      flake = false;
+    };
+    # woitb = {
+    #   url = "git+https://stuebinm.eu/git/woitb?ref=main";
+    #   flake = false;
+    # };
+    # workadventure = {
+    #   url = "git+https://stuebinm.eu/git/workadventure-nix";
+    #   flake = false;
+    # };
+    tracktrain = {
+      url = "git+https://stuebinm.eu/git/tracktrain?ref=main";
+      flake = false;
+    };
+    blog = {
+      url = "path:/home/stuebinm/Dokumente/blog";
+      flake = false;
+    };
   };
 
-  output = { self, nixpkgs, ... }@inputs: {
+  outputs = { self, nixpkgs, ... }@inputs: {
 
-    nixosConfigurations.chaski = nixpkgs.lib.nixosSystem {
-      system = "x86_64-linux";
-      modules = [ ./hosts/chaski/configuration.nix ];
-    };
+    nixosConfigurations =
+      let mkConfig = config: nixpkgs.lib.nixosSystem {
+            system = "x86_64-linux";
+            modules = [ config ./common/default.nix ];
+
+            specialArgs = { inherit inputs; };
+          };
+      in {
+        chaski = mkConfig ./hosts/chaski/configuration.nix;
+        flora = mkConfig ./hosts/flora/configuration.nix;
+      };
   };
 }
diff --git a/hosts/chaski/configuration.nix b/hosts/chaski/configuration.nix
index 55289dd..ae422cf 100644
--- a/hosts/chaski/configuration.nix
+++ b/hosts/chaski/configuration.nix
@@ -17,9 +17,12 @@
       ./services/gtfs.nix
     ];
 
-  hexchen.deploy = {
-    ssh.host = "chaski";
-  };
+  networking.firewall.allowedTCPPorts = [ 80 443 ];
+
+  services.nginx.appendHttpConfig = ''
+     access_log off;
+     add_header Permissions-Policy "interest-cohort=()";
+  '';
 
   # Use the GRUB 2 boot loader.
   boot.loader.grub.enable = true;
diff --git a/hosts/chaski/services/uplcg.nix b/hosts/chaski/services/uplcg.nix
index fa59528..5605046 100644
--- a/hosts/chaski/services/uplcg.nix
+++ b/hosts/chaski/services/uplcg.nix
@@ -1,15 +1,8 @@
-{ config, lib, pkgs, ... }:
+{ config, lib, pkgs, inputs, ... }:
 
-let
-  #sources = import ../../../nix/sources.nix;
-  uplcg-nix = fetchGit {
-    url = "https://stuebinm.eu/git/uplcg";
-    rev = "8c19e63eb67093f960be060f08a873a9d696d226";
-  };
-in
 {
   imports = [
-    "${uplcg-nix.outPath}/module.nix"
+    "${inputs.uplcg.outPath}/module.nix"
   ];
 
   services.uplcg = {
@@ -18,6 +11,7 @@ in
     domain = "0.0.0.0";
   };
 
+  services.nginx.enable = true;
   services.nginx.virtualHosts."cards.stuebinm.eu" = {
     locations."/" = {
       proxyPass = "http://localhost:9080";
diff --git a/hosts/chaski/services/woitb.nix b/hosts/chaski/services/woitb.nix
index a2d64a0..0c50617 100644
--- a/hosts/chaski/services/woitb.nix
+++ b/hosts/chaski/services/woitb.nix
@@ -1,4 +1,4 @@
-{ config, lib, pkgs, ... }:
+{ config, lib, pkgs, inputs, ... }:
 
 let
   #sources = ../../nix/sources.nix;
@@ -26,13 +26,7 @@ in
   services.nginx.virtualHosts."track.ilztal.live" = {
     enableACME = true;
     forceSSL = true;
-    locations."/".root = pkgs.copyPathToStore /home/stuebinm/Dokumente/utils/tracktrain;
+    locations."/".root = inputs.tracktrain;
   };
 
-  networking.firewall.allowedTCPPorts = [ 80 443 ];
-
-  services.nginx.appendHttpConfig = ''
-     access_log off;
-     add_header Permissions-Policy "interest-cohort=()";
-  '';
 }
diff --git a/hosts/flora/configuration.nix b/hosts/flora/configuration.nix
index 5bdc18a..b2699b7 100644
--- a/hosts/flora/configuration.nix
+++ b/hosts/flora/configuration.nix
@@ -19,10 +19,6 @@
   boot.loader.grub.version = 2;
   boot.loader.grub.devices = [ "/dev/sda" ];
 
-  hexchen.deploy = {
-    ssh.host = "flora";
-  };
-
   networking = {
     hostName = "flora";
     
diff --git a/hosts/flora/hardware-configuration.nix b/hosts/flora/hardware-configuration.nix
index faac1af..2ce21f4 100644
--- a/hosts/flora/hardware-configuration.nix
+++ b/hosts/flora/hardware-configuration.nix
@@ -1,11 +1,11 @@
 # Do not modify this file!  It was generated by ‘nixos-generate-config’
 # and may be overwritten by future invocations.  Please make changes
 # to /etc/nixos/configuration.nix instead.
-{ config, lib, pkgs, ... }:
+{ modulesPath, config, lib, pkgs, inputs, ... }:
 
 {
   imports =
-    [ <nixpkgs/nixos/modules/profiles/qemu-guest.nix>
+    [ "${modulesPath}/profiles/qemu-guest.nix"
     ];
 
   boot.initrd.availableKernelModules = [ "ata_piix" "virtio_pci" "xhci_pci" "sd_mod" "sr_mod" ];
diff --git a/hosts/flora/services/blog.nix b/hosts/flora/services/blog.nix
index 428b3fb..056a63b 100644
--- a/hosts/flora/services/blog.nix
+++ b/hosts/flora/services/blog.nix
@@ -1,9 +1,9 @@
-{ config, lib, pkgs, ... }:
+{ config, lib, pkgs, inputs, ... }:
 
 {
   services.nginx.virtualHosts."stuebinm.eu" = {
     enableACME = true;
     forceSSL = true;
-    locations."/".root = (import /home/stuebinm/Dokumente/blog);
+    locations."/".root = (import inputs.blog);
   };
 }
diff --git a/hosts/flora/services/pleroma.nix b/hosts/flora/services/pleroma.nix
index fca9d65..e93e553 100644
--- a/hosts/flora/services/pleroma.nix
+++ b/hosts/flora/services/pleroma.nix
@@ -1,8 +1,7 @@
-{config, pkgs, ...}:
+{config, pkgs, inputs, ...}:
 
 
 let
-  sources = import ../../../nix/sources.nix;
   domain = "pleroma.stuebinm.eu";
 in
 {
@@ -30,7 +29,7 @@ in
         enable = true;
 
 
-        package = (import sources.nixpkgs-unstable {}).pleroma;
+        package = (import inputs.nixpkgs-unstable {}).pleroma;
         
         # this is barely necessary at this point — all that's
         # set in here is the default_signer for joken, and the
diff --git a/lib/deploy.nix b/lib/deploy.nix
deleted file mode 100644
index 1b8d1f2..0000000
--- a/lib/deploy.nix
+++ /dev/null
@@ -1,23 +0,0 @@
-{ pkgs, hosts, groups }:
-
-with pkgs.lib; 
-
-(
-  mapAttrs (name: hosts: pkgs.writeScript "deploy-group-${name}" ''
-    #!${pkgs.runtimeShell}
-    export PATH=
-    ${concatMapStrings (host: ''
-      echo "deploying ${host.config.networking.hostName}..."
-      ${host.config.system.build.deployScript} $1 &
-      PID_LIST+=" $!"
-    '') hosts}
-    # FIXME: remove jobs from PIDLIST once they finish
-    trap "kill $PID_LIST" SIGINT
-    wait $PID_LIST
-  '') groups
-) // (
-  mapAttrs
-    (name: host: host.config.system.build.deployScript)
-    (filterAttrs (_: host: host.config.hexchen.deploy.enable) hosts)
-)
-
diff --git a/lib/hosts.nix b/lib/hosts.nix
deleted file mode 100644
index 91b6b40..0000000
--- a/lib/hosts.nix
+++ /dev/null
@@ -1,80 +0,0 @@
-{
-  pkgs,
-  hostsDir ? ../hosts,
-  commonImports ? [],
-  pkgsPath ? ../pkgs,
-  modules ? {},
-  overlays ? {},
-  profiles ? {},
-  users ? {},
-  sources ? {}
-}:
-
-with pkgs.lib;
-
-rec {
-  hostNames = attrNames (
-    filterAttrs (
-      name: type: type == "directory"
-    ) (
-      builtins.readDir hostsDir
-    )
-  );
-
-  hostConfig = hostName: { config, ... }: {
-    _module.args = {
-      inherit hosts groups;
-    };
-    imports = [
-      (import (hostsDir + "/${hostName}/configuration.nix"))
-      # urgh, yes, we still need to manually import the deploy module for now
-      # at least if i want to keep my thing reusable.
-      ../modules/deploy
-    ] ++ commonImports;
-    networking = {
-      inherit hostName;
-    };
-    nixpkgs.pkgs =
-      let pkgs = import pkgsPath {
-        inherit (config.nixpkgs) config system;
-      };
-      in if pkgs ? nixpkgs then pkgs.nixpkgs else pkgs;
-  };
-
-  hosts = listToAttrs (
-    map (
-      hostName: nameValuePair hostName (
-        import (pkgs.path + "/nixos/lib/eval-config.nix") {
-          modules = [
-            (hostConfig hostName)
-            (if sources ? home-manager then sources.home-manager + "/nixos" else {})
-          ];
-          specialArgs = { inherit modules overlays profiles users sources; };
-        }
-      )
-    ) hostNames
-  );
-
-  groupNames = unique (
-    concatLists (
-      mapAttrsToList (
-        name: host: host.config.hexchen.deploy.groups
-      ) hosts
-    )
-  );
-
-  groups = listToAttrs (
-    map (
-      groupName: nameValuePair groupName (
-        filter (
-          host: elem groupName host.config.hexchen.deploy.groups
-        ) (
-          attrValues (
-            filterAttrs (_: h: h.config.hexchen.deploy.enable) hosts
-          )
-        )
-      )
-    ) groupNames
-  );
-}
-
diff --git a/modules/default.nix b/modules/default.nix
deleted file mode 100644
index e512563..0000000
--- a/modules/default.nix
+++ /dev/null
@@ -1,9 +0,0 @@
-{...}:
-let
-  sources = import ../nix/sources.nix {};
-in
-{
-	#imports = [ "${sources.nixpkgs-unstable}/nixos/modules/services/networking/pleroma.nix" ];
-	
-	# to stop the manual breaking from the stable / unstable mix
-}
diff --git a/modules/deploy/default.nix b/modules/deploy/default.nix
deleted file mode 100644
index e8bc827..0000000
--- a/modules/deploy/default.nix
+++ /dev/null
@@ -1,50 +0,0 @@
-{ config, pkgs, lib, ... }:
-
-with lib;
-
-let
-  cfg = config.hexchen.deploy;
-
-in {
-  options = {
-    hexchen.deploy = {
-      enable = mkOption {
-        type = types.bool;
-        default = true;
-      };
-      ssh.host = mkOption {
-        type = types.str;
-        default = "${config.networking.hostName}.${config.networking.domain}";
-      };
-      ssh.port = mkOption {
-        type = types.int;
-        default = head config.services.openssh.ports;
-      };
-      substitute = mkOption {
-        type = types.bool;
-        default = true;
-      };
-      groups = mkOption {
-        type = with types; listOf str;
-        default = [];
-      };
-    };
-  };
-
-  config = mkIf cfg.enable {
-    hexchen.deploy.groups = [ "all" ];
-
-    system.build.deployScript = let
-      superuser = if config.security.sudo.enable then "sudo" else "";
-    in pkgs.writeScript "deploy-${config.networking.hostName}" ''
-      #!${pkgs.runtimeShell}
-      set -xeo pipefail
-      export PATH=${with pkgs; lib.makeBinPath [ coreutils openssh nix ]}
-      export NIX_SSHOPTS="$NIX_SSHOPTS -p${toString cfg.ssh.port}"
-      nix copy ${if cfg.substitute then "-s" else ""} --no-check-sigs --to ssh://${cfg.ssh.host} ${config.system.build.toplevel}
-      ssh $NIX_SSHOPTS ${cfg.ssh.host} "${superuser} nix-env -p /nix/var/nix/profiles/system -i ${config.system.build.toplevel}" 
-      ssh $NIX_SSHOPTS ${cfg.ssh.host} "${superuser} /nix/var/nix/profiles/system/bin/switch-to-configuration $1" 
-    '';
-  };
-}
-
diff --git a/nix/sources.json b/nix/sources.json
deleted file mode 100644
index 6dbaacf..0000000
--- a/nix/sources.json
+++ /dev/null
@@ -1,50 +0,0 @@
-{
-    "niv": {
-        "branch": "master",
-        "description": "Easy dependency management for Nix projects",
-        "homepage": "https://github.com/nmattia/niv",
-        "owner": "nmattia",
-        "repo": "niv",
-        "rev": "5830a4dd348d77e39a0f3c4c762ff2663b602d4c",
-        "sha256": "1d3lsrqvci4qz2hwjrcnd8h5vfkg8aypq3sjd4g3izbc8frwz5sm",
-        "type": "tarball",
-        "url": "https://github.com/nmattia/niv/archive/5830a4dd348d77e39a0f3c4c762ff2663b602d4c.tar.gz",
-        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
-    },
-    "nixpkgs": {
-        "branch": "release-21.11",
-        "description": "Nix Packages collection",
-        "homepage": "",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "dc6b93f729ddd8cc1222279162ef05ec7eee80e7",
-        "sha256": "0fvdwgpsfghmdc1wx1wvqpapy7n9655jj6z1zcxfn97s93xqsxb9",
-        "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/dc6b93f729ddd8cc1222279162ef05ec7eee80e7.tar.gz",
-        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
-    },
-    "nixpkgs-unstable": {
-        "branch": "nixpkgs-unstable",
-        "description": "Nix Packages collection",
-        "homepage": "",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "391f93a83c3a486475d60eb4a569bb6afbf306ad",
-        "sha256": "0s5f7j2akh3g0013880jfbigdaac1z76r9dv46yw6k254ba2r6nq",
-        "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/391f93a83c3a486475d60eb4a569bb6afbf306ad.tar.gz",
-        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
-    },
-    "woitb": {
-        "branch": "main",
-        "repo": "https://stuebinm.eu/git/woitb",
-        "rev": "e0d8ced7f417032a9d28f025b93a41dbe8303e05",
-        "type": "git"
-    },
-    "workadventure": {
-        "branch": "master",
-        "repo": "https://stuebinm.eu/git/workadventure-nix",
-        "rev": "8db4bbc5eccaac218c68fb0853f1972dadd7a40c",
-        "type": "git"
-    }
-}
diff --git a/nix/sources.nix b/nix/sources.nix
deleted file mode 100644
index 1938409..0000000
--- a/nix/sources.nix
+++ /dev/null
@@ -1,174 +0,0 @@
-# This file has been generated by Niv.
-
-let
-
-  #
-  # The fetchers. fetch_<type> fetches specs of type <type>.
-  #
-
-  fetch_file = pkgs: name: spec:
-    let
-      name' = sanitizeName name + "-src";
-    in
-      if spec.builtin or true then
-        builtins_fetchurl { inherit (spec) url sha256; name = name'; }
-      else
-        pkgs.fetchurl { inherit (spec) url sha256; name = name'; };
-
-  fetch_tarball = pkgs: name: spec:
-    let
-      name' = sanitizeName name + "-src";
-    in
-      if spec.builtin or true then
-        builtins_fetchTarball { name = name'; inherit (spec) url sha256; }
-      else
-        pkgs.fetchzip { name = name'; inherit (spec) url sha256; };
-
-  fetch_git = name: spec:
-    let
-      ref =
-        if spec ? ref then spec.ref else
-          if spec ? branch then "refs/heads/${spec.branch}" else
-            if spec ? tag then "refs/tags/${spec.tag}" else
-              abort "In git source '${name}': Please specify `ref`, `tag` or `branch`!";
-    in
-      builtins.fetchGit { url = spec.repo; inherit (spec) rev; inherit ref; };
-
-  fetch_local = spec: spec.path;
-
-  fetch_builtin-tarball = name: throw
-    ''[${name}] The niv type "builtin-tarball" is deprecated. You should instead use `builtin = true`.
-        $ niv modify ${name} -a type=tarball -a builtin=true'';
-
-  fetch_builtin-url = name: throw
-    ''[${name}] The niv type "builtin-url" will soon be deprecated. You should instead use `builtin = true`.
-        $ niv modify ${name} -a type=file -a builtin=true'';
-
-  #
-  # Various helpers
-  #
-
-  # https://github.com/NixOS/nixpkgs/pull/83241/files#diff-c6f540a4f3bfa4b0e8b6bafd4cd54e8bR695
-  sanitizeName = name:
-    (
-      concatMapStrings (s: if builtins.isList s then "-" else s)
-        (
-          builtins.split "[^[:alnum:]+._?=-]+"
-            ((x: builtins.elemAt (builtins.match "\\.*(.*)" x) 0) name)
-        )
-    );
-
-  # The set of packages used when specs are fetched using non-builtins.
-  mkPkgs = sources: system:
-    let
-      sourcesNixpkgs =
-        import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) { inherit system; };
-      hasNixpkgsPath = builtins.any (x: x.prefix == "nixpkgs") builtins.nixPath;
-      hasThisAsNixpkgsPath = <nixpkgs> == ./.;
-    in
-      if builtins.hasAttr "nixpkgs" sources
-      then sourcesNixpkgs
-      else if hasNixpkgsPath && ! hasThisAsNixpkgsPath then
-        import <nixpkgs> {}
-      else
-        abort
-          ''
-            Please specify either <nixpkgs> (through -I or NIX_PATH=nixpkgs=...) or
-            add a package called "nixpkgs" to your sources.json.
-          '';
-
-  # The actual fetching function.
-  fetch = pkgs: name: spec:
-
-    if ! builtins.hasAttr "type" spec then
-      abort "ERROR: niv spec ${name} does not have a 'type' attribute"
-    else if spec.type == "file" then fetch_file pkgs name spec
-    else if spec.type == "tarball" then fetch_tarball pkgs name spec
-    else if spec.type == "git" then fetch_git name spec
-    else if spec.type == "local" then fetch_local spec
-    else if spec.type == "builtin-tarball" then fetch_builtin-tarball name
-    else if spec.type == "builtin-url" then fetch_builtin-url name
-    else
-      abort "ERROR: niv spec ${name} has unknown type ${builtins.toJSON spec.type}";
-
-  # If the environment variable NIV_OVERRIDE_${name} is set, then use
-  # the path directly as opposed to the fetched source.
-  replace = name: drv:
-    let
-      saneName = stringAsChars (c: if isNull (builtins.match "[a-zA-Z0-9]" c) then "_" else c) name;
-      ersatz = builtins.getEnv "NIV_OVERRIDE_${saneName}";
-    in
-      if ersatz == "" then drv else
-        # this turns the string into an actual Nix path (for both absolute and
-        # relative paths)
-        if builtins.substring 0 1 ersatz == "/" then /. + ersatz else /. + builtins.getEnv "PWD" + "/${ersatz}";
-
-  # Ports of functions for older nix versions
-
-  # a Nix version of mapAttrs if the built-in doesn't exist
-  mapAttrs = builtins.mapAttrs or (
-    f: set: with builtins;
-    listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set))
-  );
-
-  # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/lists.nix#L295
-  range = first: last: if first > last then [] else builtins.genList (n: first + n) (last - first + 1);
-
-  # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L257
-  stringToCharacters = s: map (p: builtins.substring p 1 s) (range 0 (builtins.stringLength s - 1));
-
-  # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L269
-  stringAsChars = f: s: concatStrings (map f (stringToCharacters s));
-  concatMapStrings = f: list: concatStrings (map f list);
-  concatStrings = builtins.concatStringsSep "";
-
-  # https://github.com/NixOS/nixpkgs/blob/8a9f58a375c401b96da862d969f66429def1d118/lib/attrsets.nix#L331
-  optionalAttrs = cond: as: if cond then as else {};
-
-  # fetchTarball version that is compatible between all the versions of Nix
-  builtins_fetchTarball = { url, name ? null, sha256 }@attrs:
-    let
-      inherit (builtins) lessThan nixVersion fetchTarball;
-    in
-      if lessThan nixVersion "1.12" then
-        fetchTarball ({ inherit url; } // (optionalAttrs (!isNull name) { inherit name; }))
-      else
-        fetchTarball attrs;
-
-  # fetchurl version that is compatible between all the versions of Nix
-  builtins_fetchurl = { url, name ? null, sha256 }@attrs:
-    let
-      inherit (builtins) lessThan nixVersion fetchurl;
-    in
-      if lessThan nixVersion "1.12" then
-        fetchurl ({ inherit url; } // (optionalAttrs (!isNull name) { inherit name; }))
-      else
-        fetchurl attrs;
-
-  # Create the final "sources" from the config
-  mkSources = config:
-    mapAttrs (
-      name: spec:
-        if builtins.hasAttr "outPath" spec
-        then abort
-          "The values in sources.json should not have an 'outPath' attribute"
-        else
-          spec // { outPath = replace name (fetch config.pkgs name spec); }
-    ) config.sources;
-
-  # The "config" used by the fetchers
-  mkConfig =
-    { sourcesFile ? if builtins.pathExists ./sources.json then ./sources.json else null
-    , sources ? if isNull sourcesFile then {} else builtins.fromJSON (builtins.readFile sourcesFile)
-    , system ? builtins.currentSystem
-    , pkgs ? mkPkgs sources system
-    }: rec {
-      # The sources, i.e. the attribute set of spec name to spec
-      inherit sources;
-
-      # The "pkgs" (evaluated nixpkgs) to use for e.g. non-builtin fetchers
-      inherit pkgs;
-    };
-
-in
-mkSources (mkConfig {}) // { __functor = _: settings: mkSources (mkConfig settings); }